The Rockwool Flexi insulation slab is a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. The Flexi design is excellent for a range of applications including walls, partitions, floors and roofs, where a perfect fit is crucial. The flexible design of the acoustic and thermal slab enables it to be tightly fitted into timber and metal frames, removing the requirement to cut and reducing waste. The Flexi slab comes in thickness of 50,60,70,90,100 and 140mm again allowing the slab to fit almost all building specifications and requirements.Download Specification Enquire Now
ROCKWOOL FLEXI® is a multi-use, thermal, acoustic and fire insulation product with a unique flexible edge along one side.
The patented flexible edge ensures a perfect fit is maintained between the product and its supporting framework for easy installation and optimum effectiveness. FLEXI® is suitable for use between frames in walls, partitions, floors and roofs, without the need for cutting or waste. Made from renewable volcanic rock, it is extremely fire resistant and significantly reduces the carbon footprint of a building.
ROCKWOOL FLEXI® is suitable for use in a wide range of applications, including acoustic and fire insulation for partitions, separating walls and floors, as well as thermal insulation for suspended floors, walls, and roofs.
ROCKWOOL FLEXI is available in a range of thicknesses and widths, with a thermal conductivity of 0.038 W/mK, and 0.035 W/mK at 140mm thicknesses and above.
ROCKWOOL FLEXI® achieves a reaction to fire classification of A1, as defined in EN13501-1.
Thermal applications – timber frame walls The additional thermal benefits offered by using high performance (HP) breather membranes (BM) and vapour control layers (VCL) over standard membranes are shown below. Effective thermal resistance (R-values) comparisons used for external cavities are as follows:
a. Standard BM =0.18m2 K/W: or
b. Tyvek Reflex BM = 0.540m2 K/W
c. Protect TF200 Thermo = 0.77m2 K/W
Effective thermal resistance (R-values) comparisons used for service void cavities are as follows:
a. Standard VCL =0.18m2 K/W: or
b. DuPont AirGuard VCL = 0.680m2 K/W
c. Protect VC Foil = 0.78m2K/W